liblink: fix arm build errors

This was supposed to be in CL 135490044
but got lost in a transfer from machine to machine.

TBR=khr
R=khr
CC=golang-codereviews
https://golang.org/cl/135560043

src/liblink/asm5.c

@@ -309,6 +309,7 @@ static Optab	optab[] =
 	{ AUSEFIELD,	C_ADDR,	C_NONE,	C_NONE, 	 0, 0, 0 },
 	{ APCDATA,	C_LCON,	C_NONE,	C_LCON,		0, 0, 0 },
 	{ AFUNCDATA,	C_LCON,	C_NONE,	C_ADDR,	0, 0, 0 },
+	{ ANOP,		C_NONE,	C_NONE,	C_NONE,		0, 0, 0 },
 
 	{ ADUFFZERO,	C_NONE,	C_NONE,	C_SBRA,		 5, 4, 0 },  // same as ABL
 	{ ADUFFCOPY,	C_NONE,	C_NONE,	C_SBRA,		 5, 4, 0 },  // same as ABL
@@ -686,7 +687,7 @@ span5(Link *ctxt, LSym *cursym)
 				continue;
 			}
 		}
-		if(m == 0 && (p->as != AFUNCDATA && p->as != APCDATA && p->as != ADATABUNDLEEND)) {
+		if(m == 0 && (p->as != AFUNCDATA && p->as != APCDATA && p->as != ADATABUNDLEEND && p->as != ANOP)) {
 			ctxt->diag("zero-width instruction\n%P", p);
 			continue;
 		}
@@ -765,7 +766,7 @@ span5(Link *ctxt, LSym *cursym)
 			}
 			if(m/4 > nelem(out))
 				ctxt->diag("instruction size too large: %d > %d", m/4, nelem(out));
-			if(m == 0 && (p->as != AFUNCDATA && p->as != APCDATA && p->as != ADATABUNDLEEND)) {
+			if(m == 0 && (p->as != AFUNCDATA && p->as != APCDATA && p->as != ADATABUNDLEEND && p->as != ANOP)) {
 				if(p->as == ATEXT) {
 					ctxt->autosize = p->to.offset + 4;
 					continue;
@@ -1479,6 +1480,7 @@ buildop(Link *ctxt)
 		case ACLZ:
 		case AFUNCDATA:
 		case APCDATA:
+		case ANOP:
 		case ADATABUNDLE:
 		case ADATABUNDLEEND:
 			break;

src/liblink/obj5.c

@@ -466,12 +466,10 @@ addstacksplit(Link *ctxt, LSym *cursym)
 				p->as = ACMP;
 				p->from.type = D_CONST;
 				p->from.offset = 0;
-				p->to.type = D_REG;
-				p->to.reg = 1;
+				p->reg = 1;
 			
 				p = appendp(ctxt, p);
-				p->as = AB;
-				p->scond = C_SCOND_EQ;
+				p->as = ABEQ;
 				p->to.type = D_BRANCH;
 				p1 = p;
 				
@@ -495,12 +493,10 @@ addstacksplit(Link *ctxt, LSym *cursym)
 				p->as = ACMP;
 				p->from.type = D_REG;
 				p->from.offset = 2;
-				p->to.type = D_REG;
-				p->to.reg = 3;
+				p->reg = 3;
 
 				p = appendp(ctxt, p);
-				p->as = AB;
-				p->scond = C_SCOND_NE;
+				p->as = ABNE;
 				p->to.type = D_BRANCH;
 				p2 = p;